Trisazo dye.



i No Drawing.

UNITED S A ES PATENT OFFICE.

AUGUST BLANK AND WILHELM BER-GDOL'E, OF'LEVERKUSEN, GERMANY, ASSIGNORS T0 mma'sumsmxsn VORM. FRIEDR.'BAYER & 00;, or ELBERFELD, GERMANY,

A; CORPORATION OF GERMANY.

To allpuhom it may concern: Y

.Be it known that we, 'AUGUST-BLANK and \Yunucml Bnuunour, citizens of the German Empire, residinglat Leverkusen, Germany, have invented new and useful Improvements in .\zo Dyes, of which the following is a specification. I

The present invention relates to the manu- ,facture and production of a new trisazo dyestutt. The process for its production consists in combining the diazo compound of meta-aminoformanilid with :Z-amino-S- naphtliol-6-sulfonic acid, eliu'iinating the formyl radical from the product thus produced by saponification, tetrazotizing the resulting azo compound and combining the tetrazoazo compound thus produced with one molecule of meta-phenylenediamin and one molecule of the glycin of this compound. The new dye thus produced is after being dried andpulverized a dark powder soluble in water with a violetbrown color. It has a strong colorimq, power and its brown shades are fast to acids and alkalies. It can be'turther combined with diazo compounds and this combination can also be carried out on the fiber. The shades are in this manner materially deepened and rendered fast to washing.

In order to illustrate the new process more fully the following example is given, the parts being by weight :-13.6 parts of formylmeta phenylenediainin are diazotized with nitrite and H01. The diazo compound is then introduced into an alkaline solution whiclr has been prepared by dissolving 24 parts of 2-artuno-S-naphthol-G- sulfomc acid in an aqueous solution of-36 parts of sodium carbonate. After thecombination is complete the product of the reaction is heated to boiling. vThe formyl group is then eliminated from the resulting TRISAZO DYE.

Specification of Letters Patent. Patented Sept. 27, 1910. Application filed March 14, 1910. .Serial No. 549,185.

dye by heating the mixture for to 1 hour to boiling with caustic soda lye (containing 35 parts otNaOI-l). Subsequently the excess of alkali is neutraliied with hydrochloric acid. and the diamin thus obtained is after cooling with ice tetra/.otized with parts of hydrm'hloric acid. (20 B.) and 1:5 parts of nitrite, The mixture is stirred for at hours and the .tetraxo compound is then added to a cooled solution containing 11.8 parts of meta-phenylenediamin, 18 parts of the glycin of this compound and 30 parts of sodium carbonate. Afte". about; 1

hour the reaction is complete. The dye is filtered oil and dried. it yields upon reduction with stannous chlorid'aud hydrochloric acid meta phenylenediamin, triaminobenzene, 'diaminopheuylglyein' and 2.7-dia1nino-S-naphthol-(i-snltonic acid.

We claim 2- The herein described new trisazo dyestuffobtainable from formyl meta-phenylenediamin. 'l-amino-S-naphthol-G-sulfonic acid, meta-phenylenediamin and the glycinof this compound, which is after being dried and pulverized a dark powder soluble in water with a violet-brown color, dyeing cot- .ton brown shades fast. to washing after belin, and yielding upon reduction with stans nous chlorid and hydrochloric .acid meta phenylenediami'n, triaminobenzene, diaminophenylglycin and 2.7-diaimino-S-naphthol-tisulfonic acid, substantially as described.

In.testi1nony whereof, we have hereunto set our hands in the presence of two snbingdevcloped with diazotized para-nitrani- 2 

